Good post... I share your frustration. I decided to order both the Ultra Suede and the Protein Leather replacement pads. With music that is too boomy, I find the Ultra Suede pads to nicely correct the sound (not all the way, but somewhat). I also like the US pads when i am listening to classical music (e.g. string quartet) as it seems to allow better instrument separation.
Not trying to sell anything or even *vouch* for the replacement pads, but that was my experience. As I type this, I am listening to Opeth "Sorceress" on my analog playback chain - was intolerable with the default pads, but nicely loud and clean w/ the ultra suede pads.
Another thing I will mention: In general, I cringe when someone posts "...you need a different amp...", but I find these 'phones really perform with a very clean solid state amp. I actually auditioned a bunch of amps and settled on the Lehmann in my signature for both these and my Grado cans (which I love with acoustic and solo violin).